Master/slave arrangement for lighting fixture modules

A switch module comprising:

• a light sensor;
• a communication interface;
• a user interface;
• and
• circuitry adapted to:
• in a grouping mode:
• determine that a given lighting fixture of a plurality of lighting fixtures is entering a lightcast mode, in which the given lighting fixture emits a first lightcast signal via a light source of the given lighting fixture to group lighting fixtures;
• via the light sensor, monitor for the first lightcast signal provided by the given lighting fixture;
• effect generation of grouping data for the given lighting fixture based on receipt of the first lightcast signal;
• and
• send the grouping data for the given lighting fixture to at least one of the plurality of lighting fixtures;
• and
• in a control mode:
• receive user input via the user interface;
• and
• based on the user input, send an instruction to at least one of the plurality of lighting fixtures via the communication interface to control a light output level of the group.